Misalignment of teeth is one of the most widespread dental problems. Malocclusion is misalignment of teeth in the upper jaw with the teeth of the lower jaw. It is usually caused by problems with the shape or size of the jaw or teeth. Many people may have some degree of malocclusion. Malocclusion is treated by orthodontic treatment through the use of appliances, tooth removal or surgery. Orthodontics or braces can improve the appearance of teeth in children and adults who have crooked teeth or teeth with wide gaps. Braces are appliances that correct dental irregularities and are commonly used in the treatment of malocclusion. These apply constant gentle force to slowly change the position of teeth, straighten them and properly align them with the opposing teeth.